Mold for concrete blocks



F. A. ROOSA. MOLD FOR CONCRETE BLOCKS.

. APPLICATION FILED MAR. 18, 1920.

Patehted Sept. 20,1921..

Fig. 1.

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Attorhey.

V UNITED STATES PATENT OFFICE.

' FRANK LRoosA, or ORANGE TOWNSHIP, .BLAOKHAWK COUNTY, IOWA, ASSIG-NOR or ONE-HALF TO JOHN T. ZEIDLER, OF ST, JOSEPHQMISSOURI.

MOLD on con-CRETE Bnocxs. 1

1,391,5os. I 7

To all whom z't may concern:

Be it known that'I, FRANK A. RQOSA, a citizen of the United States of America," and a resident of Orange township, Blackhawk county, Iowa, have invented certain new and useful Improvements in Molds for Concrete Blocks, of which the following is a specifica- 'tion.

My invention relatesjt'oimprovements in molds for'conc'reteblocks', and theobj'ect of my improvement is to supply a mold, open at top and bottom,'and; comprising side and end lates, and havingi mechanism for elastic'al y interlocking these plates together,'operable also to release them from each other, while spreading them apart both longitudinally and transversely, to thereby become disengaged from the sides and ends of a freshly formed concrete block therein, simultaneously.

I have accomplished the above object by the means which are hereinafter described and claimed, and which are illustrated in the accompanying drawing, in'which like numerals of reference denote corresponding parts, andin which Figure 1 is a perspective 7 and bottom edge parts of the end plate sections may have horizontal slots 5 to slidably receive the headed pins 4 projected outwardly from abutting plates 2'inside the mold, when desired, the plates 2 being of requisite thickness to provide inwardly extending bosses or projections adapted to form vertically troughed broad recesses in the ends of a block when molded.

Referring now to said Fig; 2, I have provided elastically-connected corner fasteningmeans for the said side and end plates. Horizontal bars 3 are'positioned against the upper and lower parts of the outer faces of the end plates 1, for slidable reciprocations thereover. Fixed on the outer faces of the end parts of these bars or made integral Specification of Letters Patent.

Patented Sept. 20,1921.

" i Application. filed March is, 1929. Seria1 No.136 G,i844.

therewith are bosses 6, of which parts are of even thickness and parts inclined toward the bars. 7 In each barv the bosses have their inclined surfaces directed the same way, but

the inclined surfaces of the bosses on each upper bar are inclined oppositely to the directlon of incllnation of the inclined surfaces on the bosses on the'lower bars. The bosses havefmedial longitudinal slots '11 vwhich intersectiparts of, both theirflat and their incllned surfaces,'and,these slots are placed over orifices 12in the plate sections 1. V V The numeral l0-denotes brackets fixed on the outeri walls of the'side plates 13 near the outwardly projected end parts of the end plate sections 1, an'dhave' orifices alined with said orifices 12. A headed pin 8 traverses "the alined and'comrnunicatin'g slot 11 and orifice 12, also "the 'orifice'in said'bracket10,

and a helical spring 9 is connected between said pm 8 and said bracket, operatin to yieldingly elastically move the section rom the bracket, whereby, when the boss 6 is in the positionillustrated, the pin head is engaged with the outer flat surface of the boss, the spring under extension, and the section 1 held tightly in contact with the abutting I vertical edge of the side plate 13.

The numeral 14 denotes a disk placed centrally over and in contact with the outer face of the end sections 1, and may be connected to and supported by one of said sections by a pin 7 projected from the inner face of the center of the disk into a short horizontal slot or groove 19 in one of the sections 1, both pivotallyand slidably. A handle 15 on said disk permits it to be manually rocked to and fro. In the outer face of the disk are a pair of eccentric curved grooves 18, directed oppositely, and positioned on opposite sides of the pin 7 the slots extending to the circumferential edge of the disk.

Like vertical arms 16 are fixed on the bars 3 and have pins 17 extending into said curved grooves 18. When the disk is rocked plates movably connected together at their s orifices with t slopes of said wedges, an'd tension springs above actions, the pin heads riding down the inclined surfaces of the bosses so that a freshl formed concrete block in the mold is entire y-, released, so that the mold may be removed without damaging the block. 7 It is to be understood that slight changes in the forms, proportions and arrangements of the parts of the mold and its actuating means may be 'elfectedf' without departing from the scope of my invention. A

Having described my invention, whatI claim as new, and desire to secure by Letters connected to said side-plates and pins;

2; A mold, having side-plates and, end

abutting parts, elastic tensionin means'engaged between the side plates an end-plates,

" Marc and means movably mounted on the endplates and movably connected to the sideand from each other transversely.

3. A mold, comprising spaced side-plates, end-plates each formed of two 'se'ctionsalined in the same plane and movable to and from each other laterally with the outer part of plates operable to shift said side-plates to I each projecting beyond the abutting end of the adjacent side-plate and having orifices in the projection at top and bottom,brackets on the outer walls of said side-plates having orifices'in' line with the orifices in said projections, a platepositioned alongtheinner faces of each pair of said sections covering {their joint and'loosely connected thereto. for

relative, lateral movements only ofthe sections, wedge-blocks mounted uponthe outerfaces of said end-plates for, lateral movements only thereover and having longitudinal slots in communication with the said orifices in the side arts of said sections, headed pins whose hea s ride uponthe vWedge-blocks and whichextend through the said slots, said orifices in said pre'ec'aonsand the orifices in said brackets, coiled tensions rings connected between Isaid'bracketsan pins, and mechanism for shifting saidwedge-blocks to I and fro laterally. I l V Siginedat Waterloo,j Ifowa', this 1st day of 1920. v v e FRANK A. ROQSA. 

